Brake-shoe



(No Modl.)

J. N. MI'LEHAM.

BRAKE SHOE.

No. 357,284. Patented Feb. 8., 1887.

* YUN TED STATES PATENT OFFICE JOSEPH N. MILEHAM, OF JERSEY CITY, NE\V JERSEY, ASSIGNOR OF ONE.- HALF TO WILLIAM WV. SNOW, OF RAMAPO, NEW YORK.

BRAKE-SHOE.

srnorrr ca'rrolv forming part of Letters Patent No. 357,284, dated February a, 1887.

I Application filed December 2, 1886. Serial No. 220,496. (No model.)

To all whom it may concern.-

. Be it known that LJosnrrr N. MIL'EHAM, a citizen of the United States, residing at J ersey City, Hudson county, New Jersey, have invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification.

My invention relates to that class of brake- I shoes in which there is a groove in each shoe to receive the flange of the car-wheel; and it consists in constructing the shoe so as to reduce the length or continuity of the surface connecting with the flange, to permit the free access of air andthe ready escape of particles lodging in the grpovo, and toprevent the heating of the flange and the fractures resulting from the sudden cooling thereof.

In the drawings, Figure 1 is a side view of a car-wheel, partly broken away, and section of a brake-shoe, illustrating my improvement. Fig. 2 is a plan of the wheel and shoe. Fig. 3 is an outer rear face view of the shoe; Fig. 4, an outer face view of a shoe having rectangular openings. Fig. 5 is an outer face view, and Fig. 6 a perspective view, and Fig. 7 a transverse sectional view, of shoes illustrating modifications. V

In the use of that class of brake-shoes illustrated in the Letters Patent granted to G. B. Ross on the 5th day of February, 1884, in which there is a groove to receive the flange of the wheel, the latter is apt to be injured from sudden variations of temperature, resulting from the action of the shoe. Thus when such a shoe is applied forcibly to the wheel the comparatively thin flange, moving at a great speed, is brought into forcible frictional contact at its edge and both sides with the corresponding closely-fitting faces of the groove, and particles of hard dust and of iron the wheel. In order to avoid these detrimentral results and yet secure the advantages of the Ross form of brake-shoe, I reduce the length of the surface or surfaces contacting .with the flange, so that the air can get to the flange at intervals,-and so that any particles have an opportunity of escaping before being carried any great distance. By this means I reduce the friction, and consequently the heating effect, and I also cool the flange by the admission of air. The shoe may be differently constructed to'thus reduce the continuity of the flange-contacting face of the shoe.

In Figs l, 2, and 3 the shoe Ais illustrated as provided with the bearing a, head-groove w, and flangegroove y, as in the Ross brakeshoe, and also with a series of horizontal cept that the openings 20 are rectangular.

In Fig. 5 the part b of the shoe in which lodging between the contacting surfaces may the groove-y is formed is shorter than the shoe,

permitting the air to reach the flange above and below the short part b, and reducing the length of the contacting face.

In Fig. (i the part having the groove 1) therein is slotted completely across at intervals. In each case the effect is the same, the length or continuity of the, frictional surface in contact with the flange being broken and the air being admitted freely to the flange.

Instead of extending the openings radially to the outside of the shoe, they maybe in the form of lateral grooves, as shown in Fig. 7.

\Vithout limiting myself to the precise constructionand arrangement of parts shown, I claim 1. A brakeshoc having a groove to receive and fit the flange of a car-wheel and provided with a contacting face shorter than that of the main body of the shoe, substantially as described.

2. YA brake-shoe having a groove to receive the car-wheel flange, the contacting surface with said flange being reduced in length by one or more channels or opcnings,substantia11y as described.

3. A car-brake shoe having a groove to re- 5 ceive the flange of the wheel, and provided with openings or channels 10, substantially as and for the purpose set forth.

4. The combination, with a car-wheel, ofa brakeshoe having a groove receiving the IQ flange of the wheel, the contacting surface with the flange being shorter than that contacting with the tread of the wheel, substantially as and for the purpose set forth.

In testimonywhereof Ihave signed mynaine to this specification in the presence of two snbr 5 scribing witnesses. t

JOSEPH N. MILEHAM. Witnesses:

THOMAS ALDRIDG E, VILLIAM G. Conn. 

